diff options
| -rw-r--r-- | meson.build | 2 | ||||
| -rw-r--r-- | scripts/undefsym.py | 49 | ||||
| -rwxr-xr-x | scripts/undefsym.sh | 20 |
3 files changed, 50 insertions, 21 deletions
diff --git a/meson.build b/meson.build index 64e5e8a..5421eca 100644 --- a/meson.build +++ b/meson.build @@ -932,7 +932,7 @@ foreach d, list : modules endforeach nm = find_program('nm') -undefsym = find_program('scripts/undefsym.sh') +undefsym = find_program('scripts/undefsym.py') block_syms = custom_target('block.syms', output: 'block.syms', input: [libqemuutil, block_mods], capture: true, diff --git a/scripts/undefsym.py b/scripts/undefsym.py new file mode 100644 index 0000000..69a895c --- /dev/null +++ b/scripts/undefsym.py @@ -0,0 +1,49 @@ +#!/usr/bin/env python3 + +# Before a shared module's DSO is produced, a static library is built for it +# and passed to this script. The script generates -Wl,-u options to force +# the inclusion of symbol from libqemuutil.a if the shared modules need them, +# This is necessary because the modules may use functions not needed by the +# executable itself, which would cause the function to not be linked in. +# Then the DSO loading would fail because of the missing symbol. + + +import sys +import subprocess + +def filter_lines_set(stdout, from_staticlib): + linesSet = set() + for line in stdout.splitlines(): + tokens = line.split(b' ') + if len(tokens) >= 1: + if len(tokens) > 1: + if from_staticlib and tokens[1] == b'U': + continue + if not from_staticlib and tokens[1] != b'U': + continue + new_line = b'-Wl,-u,' + tokens[0] + if not new_line in linesSet: + linesSet.add(new_line) + return linesSet + +def main(args): + if len(args) <= 3: + sys.exit(0) + + nm = args[1] + staticlib = args[2] + pc = subprocess.run([nm, "-P", "-g", staticlib], stdout=subprocess.PIPE) + if pc.returncode != 0: + sys.exit(1) + staticlib_syms = filter_lines_set(pc.stdout, True) + + shared_modules = args[3:] + pc = subprocess.run([nm, "-P", "-g"] + shared_modules, stdout=subprocess.PIPE) + if pc.returncode != 0: + sys.exit(1) + modules_undef_syms = filter_lines_set(pc.stdout, False) + lines = sorted(staticlib_syms.intersection(modules_undef_syms)) + sys.stdout.buffer.write(b'\n'.join(lines)) + +if __name__ == "__main__": + main(sys.argv) diff --git a/scripts/undefsym.sh b/scripts/undefsym.sh deleted file mode 100755 index b9ec332..0000000 --- a/scripts/undefsym.sh +++ /dev/null @@ -1,20 +0,0 @@ -#! /usr/bin/env bash - -# Before a shared module's DSO is produced, a static library is built for it -# and passed to this script. The script generates -Wl,-u options to force -# the inclusion of symbol from libqemuutil.a if the shared modules need them, -# This is necessary because the modules may use functions not needed by the -# executable itself, which would cause the function to not be linked in. -# Then the DSO loading would fail because of the missing symbol. - -if test $# -le 2; then - exit 0 -fi - -NM=$1 -staticlib=$2 -shift 2 -# Find symbols defined in static libraries and undefined in shared modules -comm -12 \ - <( $NM -P -g $staticlib | awk '$2!="U"{print "-Wl,-u," $1}' | sort -u) \ - <( $NM -P -g "$@" | awk '$2=="U"{print "-Wl,-u," $1}' | sort -u) |